Thomas dillon



(No Model.)

T. DILLON. SUSPENSION BAR FOR BLEGTRIG LAMPS. No. 478,275.

Patented July 5, 18 92.

WITNESSES. 7% %wz, yd. a law ATTORNEY.

' trio lamps.

"UNITED STATES PATENT OFFICE.

THOMAS DILLON, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-HALF TO JOHNOAVEN, OF SAME PLACE.

SUSPENSION-BAR FOR ELECTRIC LAMPS.

w SPECIFICATION forming part of Letters Patent No. 478,275, dated July5, 1892.

Application filed Apn'l28,1892. Serial No. 430,949- (No model.)

To all whom it may concern.-

Be it known that I, THOMAS DILLON, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented a new and useful Improvement in Suspension-Bars forElectric Lamps, of which the following is a specification.

My invention relates to an improved suspension-bar for electric lamps.

My improvement is designed more particularly for use on swingingmast-arms for elec- It is well known that as electric lamps are usuallysuspended from a swinging mast-arm they are necessarily connected withthe electric conductor in such a manner that the conductingwire isslightly bent each time that the arm is raised or lowered by the changeof the relative positions of the arm and the lamp, and that theconductor is frequently broken thereby. The conductor is also sometimesbroken by the swaying of the lamp when suspended from a fixed arm.

The object of my improvement is'to provide means for suspending anelectric lamp so that the swinging of the lamp shall not operate to bendor flex the conducting-wire with which the lamp is connected.

The accompanying drawings illustrate my invention. I Figure 1 representsa plan of my improved suspension-barand a portion of its supporting-arm.Fig. 2 represents a front elevation of the same with an electric lampsuspended therefrom. Fig. 3 is a side elevation. Fig. 4 represents, on alarger scale, a longitudinal section of one end of the bar.

In the drawings, A is the supporting-arm, which is preferably tubular,and may be the swinging arm of an electric-light mast-arm or the freeend of a fixed arm projecting from a wall or ceiling.

Arm A terminates in a pair of bearings B B, in which is mounted atsubstantially right angles to the axis of the arm a bar 0, of wood orother non-conductor of electricity. Mounted upon the opposite ends ofthe bar 0 are a pair of metallic disks D D, each having a central hub E,which constitutes a bindingpost to receive the conductor F. Each of thedisks is recessed on one side to receive the end of the bar, and issecured thereto so as to prevent turning thereon, preferably by means ofa diametrical arm H, which enters a corresponding notch in the end ofthe bar. Each disk is provided with acircu mferential tapering groove I.

The lamp J is suspended from the disks D by means of a pair ofconducting-wires L L, each having at its upper end a loop M, formed ofone or more turns of the wire and resting in the groove I of the disk,the arrangement being such that while the loops M of the wires L closelyembrace the grooved portion of the disks they are free to turn thereon.

In operation the ends of the conductor F, forming the loop or electriccircuit with which the lamp is tobe connected, are inserted,respectively, in the binding-posts E, which form the hubs of the disks.The con- 7o ductor F passes, preferably, along the interior of the arm Aand along a central longitudinal perforation N in the bar 0; but it mayextend along the outside of the arm and be connected directly with thebinding-posts E without passing through the bar.

The disks D are insulated from each other by the bar 0 and form parts ofthe electric conductor, which moves at'all times with the arm A withoutbending. I

The wires"L, which connect with the opposite sides of the lamp-circuitand form suspending-rods for the lamp,being at'all times in closecontact with the disks D and being free to turn thereon, the lamp isfree to swing and to change its relation to the suspensionbar and thearm in which the suspension-bar is mounted without bending any portionof the conductor.

I claim as my invent-ion o 1. The above-described suspension-bar forelectric lamps, consisting of a bar of wood or other non-conductingmaterial and a pair of metallic disks mounted upon the opposite ends ofsaid bar, and each provided with a peripheral groove and a binding-postadapted to receive an electric conductor, substantially I as set forth.

2. The combination of the wooden bar, the and the lamp suspended fromsaid rods, so arm arranged to support said bar, the pair of as to forman electric circuit therewith, all peripherally-grooved disks secured tothe opsubstantially as and for the purpose set forth. IO

posite ends of the bar and each provided with THOMAS DILLON. 5 abinding-post and forming a part of an elec- Witnesses:

trio circuit, the pair of suspending-rods, each V. M. HOOD,

having a loop embracing one of said disks, H. P. HOOD.

